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Product Advertising API
Developer Guide (API Version 2013-08-01)

Variations

An item can come in a variety of sizes and colors. Each color and size combination is called a variation. Each variation, such as a medium, blue shirt, is an item that a customer can buy. Each item variation has its own ASIN. For example, a shirt in four sizes and six colors has 24 variations, each with a unique ASIN.